const add =  new Promise((resolve) => {
  console.log("大傻傻的开始")
  resolve("hello");
});
  
add.then((result) => {
    return result + " lagou";
  })
  .then((value) => {
    return value + " I LOVE YOU"
  })
  .then(value=>{
    console.log(value)
  })
  .catch((err) => {});

